;;; scgamewidgets.scm - a scheme game library (needs scx-0.2 or scheme48-fb)
;;;
;;; Copyright (c) 2011-2012 Johan Ceuppens
;;;
;;; All rights reserved.
;;;
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;; 1. Redistributions of source code must retain the above copyright
;;;    notice, this list of conditions and the following disclaimer.
;;; 2. Redistributions in binary form must reproduce the above copyright
;;;    notice, this list of conditions and the following disclaimer in the
;;;    documentation and/or other materials provided with the distribution.
;;; 3. The name of the authors may not be used to endorse or promote products
;;;    derived from this software without specific prior written permission.
;;;
;;; THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
;;; IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
;;; OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
;;; IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
;;; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
;;; NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
;;; DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
;;; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
;;; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
;;; THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

(load "scgame.scm")

;; for inits see scgame.scm

;; FIXME refactor and cleanup
;;
;; run (widget-tree-eventloop dpy win widget-tree)

;; widget tree

(define (make-widget-tree)
  '())

(define (make-widget-tree-leaf widget)
  (delay widget))

(define (widget-leaf? n)
  (and (widget? n)(not (list? n))))

(define (make-widget-tree-node widgetlist)
  (delay widgetlist))

(define (widget-node? n)
  (and (not (widget? n))(list? n)))

(define (widget-tree-add! tree n)
  (set! tree (append tree (list n))))

(define (widget-node-add! node n)
  (set! node (append node (list n))))

;; throws backwards inner widget
(define (widget-node-collide? node x y)
  (define (frec l)
    (cond ((null? l) #f)
          ((list? (car l))
           (frec (car l)))
          ((and (widget? (car l))
                (>= x (((car l)'get-x)))
                (<= x (+ (((car l)'get-x)))(((car l)'get-w)))
                (>= y (((car l)'get-y)))
                (<= y (+ (((car l)'get-y)))(((car l)'get-h))))
           (car l))
          (else (frec (cdr l)))))

  (if (widget-node? node)
      (for-each frec (force node))
      #f))

(define (widget-leaf-collide? leaf x y)
  (if (widget-leaf? leaf)
      (cond ((and (widget? leaf)
                  (>= x ((leaf 'get-x)))
                  (<= x (+ ((leaf 'get-x)))((leaf 'get-w)))
                  (>= y ((leaf 'get-y)))
                  (<= y (+ ((leaf 'get-y)))((leaf 'get-h))))
             #t))
      #f))

;; widgets

(define (make-scgame-widget)
  (define (draw)
    (display-msg "widget - draw - subclass responsability"))

  (define (widget?)
    #t)

  (define (get-x)
    (display-msg "widget - get-x - subclass responsability")
    0)

  (define (get-y)
    (display-msg "widget - get-y - subclass responsability")
    0)

  (define (get-w)
    (display-msg "widget - get-w - subclass responsability")
    0)

  (define (get-h)
    (display-msg "widget - get-h - subclass responsability")
    0)

  (lambda (msg)
    (cond ((eq? msg 'draw) draw)
          ((eq? msg 'widget?) widget?)
          (else
           (display-msg "subclass responsability")))))

(define (make-button-widget xx yy)
  (let ((widget (make-scgame-widget))
	(image #f) ;; pixel array
        (pressed-image #f) ;; pixel array
        (pressed #f)
        (x xx)
        (y yy)
        (width 0)
        (height 0))

    (define (get-x)
      x)

    (define (get-y)
      y)

    (define (get-w)
      w)

    (define (get-h)
      h)

    (define (set-image win filename)
      (set! image (((make-scimage2)'load-image) win filename))
      (let ((wh (vector-ref (list->vector image) 1)))
        (set! width (car wh))
        (set! height (cadr wh))
        ))

    (define (set-pressed-image win filename)
      (set! pressed-image (((make-scimage2)'load-image) win filename))
      (let ((wh (vector-ref (list->vector image) 1)))
        (set! width (car wh))
        (set! height (cadr wh))
        ))

    (define (draw-pressed-image dpy win gc)
      (init-sync-x-events dpy)
      (map-window dpy win)
      (draw-points dpy win gc (* width height) 0 0
                   (/ width 2) (/ height 2)))

    ;; NOTE : you can remap a button (image) to a new window win if you like
    (define (draw-image dpy win gc)
      (init-sync-x-events dpy)
      (map-window dpy win)
      (draw-points dpy win gc (* width height) 0 0
                   (/ width 2) (/ height 2)))

    (define (draw-points dpy win gc count x y)
      (if (zero? (modulo count 100))
          (display-flush dpy))
      (if (not (zero? count))
          (let ((xf (floor (* (+ 1.2 x) width))) ; These lines center the picture
                (yf (floor (* (+ 0.5 y) height))))
            (draw-point dpy win gc (inexact->exact xf) (inexact->exact yf))
            (draw-points dpy win gc ;; FIXME1
                         (- count 1)
                         (- (* y (+ 1 (sin (* 0.7 x))))
                            (* 1.2 (sqrt (abs x))))
                         (- 0.21 x)
                         width height))))

    (define (draw)
      (if pressed
          (draw-image)
          (draw-pressed-image))
      (map-window dpy win))

    (define (press!)
      (press-button dpy win gc)
      (set! pressed #t))

    (define (release!)
      (release-button dpy win gc)
      (set! pressed #f))


    (lambda (msg)
      (cond ((eq? 'set-image) set-image)
            ((eq? 'set-pressed-image) set-pressed-image)
            ((eq? 'press!) press!)
            ((eq? 'release!) release!)
            ((eq? get-x) get-x)
            ((eq? get-y) get-y)
            ((eq? get-w) get-w)
            ((eq? get-h) get-h)
            ((eq? draw) draw)
	    (widget msg)
	    ))))

;; This is the main loop you call on your window's
;; widget tree (see above)

(define (widget-tree-eventloop dpy win widget-tree)
  (let ((mousex 0)
        (mousey 0))
    (init-sync-x-events dpy)
    (map-window dpy win)
    (call-with-event-channel
     dpy win (event-mask button-press)
     (lambda (channel)
       ;; FIXME calibrate at 10 times or using nanosleep
       (let loop ()
         (if
          (let ((e (receive channel)))
            (cond
             ((motion-event? e)
              (set! mousex motion-event-x)
              (set! mousey motion-event-y))
             ((map-event? e)
              (map-window dpy map-event-window))
             ((unmap-event? e)
              (unmap-window dpy unmap-event-window))
             ((button-event? e)
              (let ((state button-event-state))
                (let ((widget (widget-node-collide? widget-tree mousex mouse)))
                  (if state
                      ((widget 'press!))
                      ((widget 'release!))))))
             ((expose-event? e)
              (expose-window dpy expose-event-window))
             ((destroy-widow-event? e)
              (expose-window dpy destroy-window-event-window))
             (else #f))))
         (loop))))))